// deno-lint-ignore-file no-var
/*!
 * The buffer module from node.js, for the browser.
 * 5.7.1
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */
import * as base64 from './base64.js';
import * as ieee754 from './ieee754.js';

var customInspectSymbol =
    (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation
        ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
        : null

const INSPECT_MAX_BYTES = 50
const K_MAX_LENGTH = 0x7fffffff
const kMaxLength = K_MAX_LENGTH



/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
 *               implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * We report that the browser does not support typed arrays if the are not subclassable
 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
 * for __proto__ and has a buggy typed array implementation.
 */
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
    typeof console.error === 'function') {
    console.error(
        'This browser lacks typed array (Uint8Array) support which is required by ' +
        '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
    )
}

function typedArraySupport() {
    // Can typed array instances can be augmented?
    try {
        var arr = new Uint8Array(1)
        var proto = { foo: function () { return 42 } }
        Object.setPrototypeOf(proto, Uint8Array.prototype)
        Object.setPrototypeOf(arr, proto)
        return arr.foo() === 42
    } catch (e) {
        return false
    }
}

Object.defineProperty(Buffer.prototype, 'parent', {
    enumerable: true,
    get: function () {
        if (!Buffer.isBuffer(this)) return undefined
        return this.buffer
    }
})

Object.defineProperty(Buffer.prototype, 'offset', {
    enumerable: true,
    get: function () {
        if (!Buffer.isBuffer(this)) return undefined
        return this.byteOffset
    }
})

function createBuffer(length) {
    if (length > K_MAX_LENGTH) {
        throw new RangeError('The value "' + length + '" is invalid for option "size"')
    }
    // Return an augmented `Uint8Array` instance
    var buf = new Uint8Array(length)
    Object.setPrototypeOf(buf, Buffer.prototype)
    return buf
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer(arg, encodingOrOffset, length) {
    // Common case.
    if (typeof arg === 'number') {
        if (typeof encodingOrOffset === 'string') {
            throw new TypeError(
                'The "string" argument must be of type string. Received type number'
            )
        }
        return allocUnsafe(arg)
    }
    return from(arg, encodingOrOffset, length)
}

Buffer.poolSize = 8192 // not used by this implementation

function from(value, encodingOrOffset, length) {
    if (typeof value === 'string') {
        return fromString(value, encodingOrOffset)
    }

    if (ArrayBuffer.isView(value)) {
        return fromArrayView(value)
    }

    if (value == null) {
        throw new TypeError(
            'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
            'or Array-like Object. Received type ' + (typeof value)
        )
    }

    if (isInstance(value, ArrayBuffer) ||
        (value && isInstance(value.buffer, ArrayBuffer))) {
        return fromArrayBuffer(value, encodingOrOffset, length)
    }

    if (typeof SharedArrayBuffer !== 'undefined' &&
        (isInstance(value, SharedArrayBuffer) ||
            (value && isInstance(value.buffer, SharedArrayBuffer)))) {
        return fromArrayBuffer(value, encodingOrOffset, length)
    }

    if (typeof value === 'number') {
        throw new TypeError(
            'The "value" argument must not be of type number. Received type number'
        )
    }

    var valueOf = value.valueOf && value.valueOf()
    if (valueOf != null && valueOf !== value) {
        return Buffer.from(valueOf, encodingOrOffset, length)
    }

    var b = fromObject(value)
    if (b) return b

    if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
        typeof value[Symbol.toPrimitive] === 'function') {
        return Buffer.from(
            value[Symbol.toPrimitive]('string'), encodingOrOffset, length
        )
    }

    throw new TypeError(
        'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
        'or Array-like Object. Received type ' + (typeof value)
    )
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
    return from(value, encodingOrOffset, length)
}

// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)
Object.setPrototypeOf(Buffer, Uint8Array)

function assertSize(size) {
    if (typeof size !== 'number') {
        throw new TypeError('"size" argument must be of type number')
    } else if (size < 0) {
        throw new RangeError('The value "' + size + '" is invalid for option "size"')
    }
}

function alloc(size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
        return createBuffer(size)
    }
    if (fill !== undefined) {
        // Only pay attention to encoding if it's a string. This
        // prevents accidentally sending in a number that would
        // be interpreted as a start offset.
        return typeof encoding === 'string'
            ? createBuffer(size).fill(fill, encoding)
            : createBuffer(size).fill(fill)
    }
    return createBuffer(size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
    return alloc(size, fill, encoding)
}

function allocUnsafe(size) {
    assertSize(size)
    return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
    return allocUnsafe(size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(size)
}

function fromString(string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
        encoding = 'utf8'
    }

    if (!Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
    }

    var length = byteLength(string, encoding) | 0
    var buf = createBuffer(length)

    var actual = buf.write(string, encoding)

    if (actual !== length) {
        // Writing a hex string, for example, that contains invalid characters will
        // cause everything after the first invalid character to be ignored. (e.g.
        // 'abxxcd' will be treated as 'ab')
        buf = buf.slice(0, actual)
    }

    return buf
}

function fromArrayLike(array) {
    var length = array.length < 0 ? 0 : checked(array.length) | 0
    var buf = createBuffer(length)
    for (var i = 0; i < length; i += 1) {
        buf[i] = array[i] & 255
    }
    return buf
}

function fromArrayView(arrayView) {
    if (isInstance(arrayView, Uint8Array)) {
        var copy = new Uint8Array(arrayView)
        return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
    }
    return fromArrayLike(arrayView)
}

function fromArrayBuffer(array, byteOffset, length) {
    if (byteOffset < 0 || array.byteLength < byteOffset) {
        throw new RangeError('"offset" is outside of buffer bounds')
    }

    if (array.byteLength < byteOffset + (length || 0)) {
        throw new RangeError('"length" is outside of buffer bounds')
    }

    var buf
    if (byteOffset === undefined && length === undefined) {
        buf = new Uint8Array(array)
    } else if (length === undefined) {
        buf = new Uint8Array(array, byteOffset)
    } else {
        buf = new Uint8Array(array, byteOffset, length)
    }

    // Return an augmented `Uint8Array` instance
    Object.setPrototypeOf(buf, Buffer.prototype)

    return buf
}

function fromObject(obj) {
    if (Buffer.isBuffer(obj)) {
        var len = checked(obj.length) | 0
        var buf = createBuffer(len)

        if (buf.length === 0) {
            return buf
        }

        obj.copy(buf, 0, 0, len)
        return buf
    }

    if (obj.length !== undefined) {
        if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
            return createBuffer(0)
        }
        return fromArrayLike(obj)
    }

    if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
        return fromArrayLike(obj.data)
    }
}

function checked(length) {
    // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= K_MAX_LENGTH) {
        throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
            'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
    }
    return length | 0
}

function SlowBuffer(length) {
    if (+length != length) { // eslint-disable-line eqeqeq
        length = 0
    }
    return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer(b) {
    return b != null && b._isBuffer === true &&
        b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
}

Buffer.compare = function compare(a, b) {
    if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
    if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
    if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
        throw new TypeError(
            'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
        )
    }

    if (a === b) return 0

    var x = a.length
    var y = b.length

    for (var i = 0, len = Math.min(x, y); i < len; ++i) {
        if (a[i] !== b[i]) {
            x = a[i]
            y = b[i]
            break
        }
    }

    if (x < y) return -1
    if (y < x) return 1
    return 0
}

Buffer.isEncoding = function isEncoding(encoding) {
    switch (String(encoding).toLowerCase()) {
        case 'hex':
        case 'utf8':
        case 'utf-8':
        case 'ascii':
        case 'latin1':
        case 'binary':
        case 'base64':
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
            return true
        default:
            return false
    }
}

Buffer.concat = function concat(list, length) {
    if (!Array.isArray(list)) {
        throw new TypeError('"list" argument must be an Array of Buffers')
    }

    if (list.length === 0) {
        return Buffer.alloc(0)
    }

    var i
    if (length === undefined) {
        length = 0
        for (i = 0; i < list.length; ++i) {
            length += list[i].length
        }
    }

    var buffer = Buffer.allocUnsafe(length)
    var pos = 0
    for (i = 0; i < list.length; ++i) {
        var buf = list[i]
        if (isInstance(buf, Uint8Array)) {
            if (pos + buf.length > buffer.length) {
                Buffer.from(buf).copy(buffer, pos)
            } else {
                Uint8Array.prototype.set.call(
                    buffer,
                    buf,
                    pos
                )
            }
        } else if (!Buffer.isBuffer(buf)) {
            throw new TypeError('"list" argument must be an Array of Buffers')
        } else {
            buf.copy(buffer, pos)
        }
        pos += buf.length
    }
    return buffer
}

function byteLength(string, encoding) {
    if (Buffer.isBuffer(string)) {
        return string.length
    }
    if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
        return string.byteLength
    }
    if (typeof string !== 'string') {
        throw new TypeError(
            'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
            'Received type ' + typeof string
        )
    }

    var len = string.length
    var mustMatch = (arguments.length > 2 && arguments[2] === true)
    if (!mustMatch && len === 0) return 0

    // Use a for loop to avoid recursion
    var loweredCase = false
    for (; ;) {
        switch (encoding) {
            case 'ascii':
            case 'latin1':
            case 'binary':
                return len
            case 'utf8':
            case 'utf-8':
                return utf8ToBytes(string).length
            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return len * 2
            case 'hex':
                return len >>> 1
            case 'base64':
                return base64ToBytes(string).length
            default:
                if (loweredCase) {
                    return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
                }
                encoding = ('' + encoding).toLowerCase()
                loweredCase = true
        }
    }
}
Buffer.byteLength = byteLength

function slowToString(encoding, start, end) {
    var loweredCase = false

    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.

    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
        start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
        return ''
    }

    if (end === undefined || end > this.length) {
        end = this.length
    }

    if (end <= 0) {
        return ''
    }

    // Force coercion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0

    if (end <= start) {
        return ''
    }

    if (!encoding) encoding = 'utf8'

    while (true) {
        switch (encoding) {
            case 'hex':
                return hexSlice(this, start, end)

            case 'utf8':
            case 'utf-8':
                return utf8Slice(this, start, end)

            case 'ascii':
                return asciiSlice(this, start, end)

            case 'latin1':
            case 'binary':
                return latin1Slice(this, start, end)

            case 'base64':
                return base64Slice(this, start, end)

            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return utf16leSlice(this, start, end)

            default:
                if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                encoding = (encoding + '').toLowerCase()
                loweredCase = true
        }
    }
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true

function swap(b, n, m) {
    var i = b[n]
    b[n] = b[m]
    b[m] = i
}

Buffer.prototype.swap16 = function swap16() {
    var len = this.length
    if (len % 2 !== 0) {
        throw new RangeError('Buffer size must be a multiple of 16-bits')
    }
    for (var i = 0; i < len; i += 2) {
        swap(this, i, i + 1)
    }
    return this
}

Buffer.prototype.swap32 = function swap32() {
    var len = this.length
    if (len % 4 !== 0) {
        throw new RangeError('Buffer size must be a multiple of 32-bits')
    }
    for (var i = 0; i < len; i += 4) {
        swap(this, i, i + 3)
        swap(this, i + 1, i + 2)
    }
    return this
}

Buffer.prototype.swap64 = function swap64() {
    var len = this.length
    if (len % 8 !== 0) {
        throw new RangeError('Buffer size must be a multiple of 64-bits')
    }
    for (var i = 0; i < len; i += 8) {
        swap(this, i, i + 7)
        swap(this, i + 1, i + 6)
        swap(this, i + 2, i + 5)
        swap(this, i + 3, i + 4)
    }
    return this
}

Buffer.prototype.toString = function toString() {
    var length = this.length
    if (length === 0) return ''
    if (arguments.length === 0) return utf8Slice(this, 0, length)
    return slowToString.apply(this, arguments)
}

Buffer.prototype.toLocaleString = Buffer.prototype.toString

Buffer.prototype.equals = function equals(b) {
    if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
    if (this === b) return true
    return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect() {
    var str = ''
    var max = INSPECT_MAX_BYTES
    str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
    if (this.length > max) str += ' ... '
    return '<Buffer ' + str + '>'
}
if (customInspectSymbol) {
    Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect
}

Buffer.prototype.compare = function compare(target, start, end, thisStart, thisEnd) {
    if (isInstance(target, Uint8Array)) {
        target = Buffer.from(target, target.offset, target.byteLength)
    }
    if (!Buffer.isBuffer(target)) {
        throw new TypeError(
            'The "target" argument must be one of type Buffer or Uint8Array. ' +
            'Received type ' + (typeof target)
        )
    }

    if (start === undefined) {
        start = 0
    }
    if (end === undefined) {
        end = target ? target.length : 0
    }
    if (thisStart === undefined) {
        thisStart = 0
    }
    if (thisEnd === undefined) {
        thisEnd = this.length
    }

    if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
        throw new RangeError('out of range index')
    }

    if (thisStart >= thisEnd && start >= end) {
        return 0
    }
    if (thisStart >= thisEnd) {
        return -1
    }
    if (start >= end) {
        return 1
    }

    start >>>= 0
    end >>>= 0
    thisStart >>>= 0
    thisEnd >>>= 0

    if (this === target) return 0

    var x = thisEnd - thisStart
    var y = end - start
    var len = Math.min(x, y)

    var thisCopy = this.slice(thisStart, thisEnd)
    var targetCopy = target.slice(start, end)

    for (var i = 0; i < len; ++i) {
        if (thisCopy[i] !== targetCopy[i]) {
            x = thisCopy[i]
            y = targetCopy[i]
            break
        }
    }

    if (x < y) return -1
    if (y < x) return 1
    return 0
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1

    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
        encoding = byteOffset
        byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
        byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
        byteOffset = -0x80000000
    }
    byteOffset = +byteOffset // Coerce to Number.
    if (numberIsNaN(byteOffset)) {
        // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
        byteOffset = dir ? 0 : (buffer.length - 1)
    }

    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
        if (dir) return -1
        else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
        if (dir) byteOffset = 0
        else return -1
    }

    // Normalize val
    if (typeof val === 'string') {
        val = Buffer.from(val, encoding)
    }

    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
        // Special case: looking for empty string/buffer always fails
        if (val.length === 0) {
            return -1
        }
        return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
        val = val & 0xFF // Search for a byte value [0-255]
        if (typeof Uint8Array.prototype.indexOf === 'function') {
            if (dir) {
                return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
            } else {
                return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
            }
        }
        return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)
    }

    throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf(arr, val, byteOffset, encoding, dir) {
    var indexSize = 1
    var arrLength = arr.length
    var valLength = val.length

    if (encoding !== undefined) {
        encoding = String(encoding).toLowerCase()
        if (encoding === 'ucs2' || encoding === 'ucs-2' ||
            encoding === 'utf16le' || encoding === 'utf-16le') {
            if (arr.length < 2 || val.length < 2) {
                return -1
            }
            indexSize = 2
            arrLength /= 2
            valLength /= 2
            byteOffset /= 2
        }
    }

    function read(buf, i) {
        if (indexSize === 1) {
            return buf[i]
        } else {
            return buf.readUInt16BE(i * indexSize)
        }
    }

    var i
    if (dir) {
        var foundIndex = -1
        for (i = byteOffset; i < arrLength; i++) {
            if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
                if (foundIndex === -1) foundIndex = i
                if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
            } else {
                if (foundIndex !== -1) i -= i - foundIndex
                foundIndex = -1
            }
        }
    } else {
        if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
        for (i = byteOffset; i >= 0; i--) {
            var found = true
            for (var j = 0; j < valLength; j++) {
                if (read(arr, i + j) !== read(val, j)) {
                    found = false
                    break
                }
            }
            if (found) return i
        }
    }

    return -1
}

Buffer.prototype.includes = function includes(val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf(val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf(val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite(buf, string, offset, length) {
    offset = Number(offset) || 0
    var remaining = buf.length - offset
    if (!length) {
        length = remaining
    } else {
        length = Number(length)
        if (length > remaining) {
            length = remaining
        }
    }

    var strLen = string.length

    if (length > strLen / 2) {
        length = strLen / 2
    }
    for (var i = 0; i < length; ++i) {
        var parsed = parseInt(string.substr(i * 2, 2), 16)
        if (numberIsNaN(parsed)) return i
        buf[offset + i] = parsed
    }
    return i
}

function utf8Write(buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite(buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function base64Write(buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write(buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write(string, offset, length, encoding) {
    // Buffer#write(string)
    if (offset === undefined) {
        encoding = 'utf8'
        length = this.length
        offset = 0
        // Buffer#write(string, encoding)
    } else if (length === undefined && typeof offset === 'string') {
        encoding = offset
        length = this.length
        offset = 0
        // Buffer#write(string, offset[, length][, encoding])
    } else if (isFinite(offset)) {
        offset = offset >>> 0
        if (isFinite(length)) {
            length = length >>> 0
            if (encoding === undefined) encoding = 'utf8'
        } else {
            encoding = length
            length = undefined
        }
    } else {
        throw new Error(
            'Buffer.write(string, encoding, offset[, length]) is no longer supported'
        )
    }

    var remaining = this.length - offset
    if (length === undefined || length > remaining) length = remaining

    if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
        throw new RangeError('Attempt to write outside buffer bounds')
    }

    if (!encoding) encoding = 'utf8'

    var loweredCase = false
    for (; ;) {
        switch (encoding) {
            case 'hex':
                return hexWrite(this, string, offset, length)

            case 'utf8':
            case 'utf-8':
                return utf8Write(this, string, offset, length)

            case 'ascii':
            case 'latin1':
            case 'binary':
                return asciiWrite(this, string, offset, length)

            case 'base64':
                // Warning: maxLength not taken into account in base64Write
                return base64Write(this, string, offset, length)

            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return ucs2Write(this, string, offset, length)

            default:
                if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                encoding = ('' + encoding).toLowerCase()
                loweredCase = true
        }
    }
}

Buffer.prototype.toJSON = function toJSON() {
    return {
        type: 'Buffer',
        data: Array.prototype.slice.call(this._arr || this, 0)
    }
}

function base64Slice(buf, start, end) {
    if (start === 0 && end === buf.length) {
        return base64.fromByteArray(buf)
    } else {
        return base64.fromByteArray(buf.slice(start, end))
    }
}

function utf8Slice(buf, start, end) {
    end = Math.min(buf.length, end)
    var res = []

    var i = start
    while (i < end) {
        var firstByte = buf[i]
        var codePoint = null
        var bytesPerSequence = (firstByte > 0xEF)
            ? 4
            : (firstByte > 0xDF)
                ? 3
                : (firstByte > 0xBF)
                    ? 2
                    : 1

        if (i + bytesPerSequence <= end) {
            var secondByte, thirdByte, fourthByte, tempCodePoint

            switch (bytesPerSequence) {
                case 1:
                    if (firstByte < 0x80) {
                        codePoint = firstByte
                    }
                    break
                case 2:
                    secondByte = buf[i + 1]
                    if ((secondByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                        if (tempCodePoint > 0x7F) {
                            codePoint = tempCodePoint
                        }
                    }
                    break
                case 3:
                    secondByte = buf[i + 1]
                    thirdByte = buf[i + 2]
                    if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                            codePoint = tempCodePoint
                        }
                    }
                    break
                case 4:
                    secondByte = buf[i + 1]
                    thirdByte = buf[i + 2]
                    fourthByte = buf[i + 3]
                    if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                            codePoint = tempCodePoint
                        }
                    }
            }
        }

        if (codePoint === null) {
            // we did not generate a valid codePoint so insert a
            // replacement char (U+FFFD) and advance only 1 byte
            codePoint = 0xFFFD
            bytesPerSequence = 1
        } else if (codePoint > 0xFFFF) {
            // encode to utf16 (surrogate pair dance)
            codePoint -= 0x10000
            res.push(codePoint >>> 10 & 0x3FF | 0xD800)
            codePoint = 0xDC00 | codePoint & 0x3FF
        }

        res.push(codePoint)
        i += bytesPerSequence
    }

    return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray(codePoints) {
    var len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
        return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }

    // Decode in chunks to avoid "call stack size exceeded".
    var res = ''
    var i = 0
    while (i < len) {
        res += String.fromCharCode.apply(
            String,
            codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
        )
    }
    return res
}

function asciiSlice(buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)

    for (var i = start; i < end; ++i) {
        ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
}

function latin1Slice(buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)

    for (var i = start; i < end; ++i) {
        ret += String.fromCharCode(buf[i])
    }
    return ret
}

function hexSlice(buf, start, end) {
    var len = buf.length

    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len

    var out = ''
    for (var i = start; i < end; ++i) {
        out += hexSliceLookupTable[buf[i]]
    }
    return out
}

function utf16leSlice(buf, start, end) {
    var bytes = buf.slice(start, end)
    var res = ''
    // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
    for (var i = 0; i < bytes.length - 1; i += 2) {
        res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
    }
    return res
}

Buffer.prototype.slice = function slice(start, end) {
    var len = this.length
    start = ~~start
    end = end === undefined ? len : ~~end

    if (start < 0) {
        start += len
        if (start < 0) start = 0
    } else if (start > len) {
        start = len
    }

    if (end < 0) {
        end += len
        if (end < 0) end = 0
    } else if (end > len) {
        end = len
    }

    if (end < start) end = start

    var newBuf = this.subarray(start, end)
    // Return an augmented `Uint8Array` instance
    Object.setPrototypeOf(newBuf, Buffer.prototype)

    return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset(offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUintLE =
    Buffer.prototype.readUIntLE = function readUIntLE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) checkOffset(offset, byteLength, this.length)

        var val = this[offset]
        var mul = 1
        var i = 0
        while (++i < byteLength && (mul *= 0x100)) {
            val += this[offset + i] * mul
        }

        return val
    }

Buffer.prototype.readUintBE =
    Buffer.prototype.readUIntBE = function readUIntBE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            checkOffset(offset, byteLength, this.length)
        }

        var val = this[offset + --byteLength]
        var mul = 1
        while (byteLength > 0 && (mul *= 0x100)) {
            val += this[offset + --byteLength] * mul
        }

        return val
    }

Buffer.prototype.readUint8 =
    Buffer.prototype.readUInt8 = function readUInt8(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 1, this.length)
        return this[offset]
    }

Buffer.prototype.readUint16LE =
    Buffer.prototype.readUInt16LE = function readUInt16LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        return this[offset] | (this[offset + 1] << 8)
    }

Buffer.prototype.readUint16BE =
    Buffer.prototype.readUInt16BE = function readUInt16BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        return (this[offset] << 8) | this[offset + 1]
    }

Buffer.prototype.readUint32LE =
    Buffer.prototype.readUInt32LE = function readUInt32LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return ((this[offset]) |
            (this[offset + 1] << 8) |
            (this[offset + 2] << 16)) +
            (this[offset + 3] * 0x1000000)
    }

Buffer.prototype.readUint32BE =
    Buffer.prototype.readUInt32BE = function readUInt32BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return (this[offset] * 0x1000000) +
            ((this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                this[offset + 3])
    }

Buffer.prototype.readIntLE = function readIntLE(offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)

    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
        val += this[offset + i] * mul
    }
    mul *= 0x80

    if (val >= mul) val -= Math.pow(2, 8 * byteLength)

    return val
}

Buffer.prototype.readIntBE = function readIntBE(offset, byteLength, noAssert) {
    offset = offset >>> 0
    byteLength = byteLength >>> 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)

    var i = byteLength
    var mul = 1
    var val = this[offset + --i]
    while (i > 0 && (mul *= 0x100)) {
        val += this[offset + --i] * mul
    }
    mul *= 0x80

    if (val >= mul) val -= Math.pow(2, 8 * byteLength)

    return val
}

Buffer.prototype.readInt8 = function readInt8(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 1, this.length)
    if (!(this[offset] & 0x80)) return (this[offset])
    return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset] | (this[offset + 1] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset + 1] | (this[offset] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)

    return (this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16) |
        (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)

    return (this[offset] << 24) |
        (this[offset + 1] << 16) |
        (this[offset + 2] << 8) |
        (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE(offset, noAssert) {
    offset = offset >>> 0
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, false, 52, 8)
}

function checkInt(buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUintLE =
    Buffer.prototype.writeUIntLE = function writeUIntLE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            var maxBytes = Math.pow(2, 8 * byteLength) - 1
            checkInt(this, value, offset, byteLength, maxBytes, 0)
        }

        var mul = 1
        var i = 0
        this[offset] = value & 0xFF
        while (++i < byteLength && (mul *= 0x100)) {
            this[offset + i] = (value / mul) & 0xFF
        }

        return offset + byteLength
    }

Buffer.prototype.writeUintBE =
    Buffer.prototype.writeUIntBE = function writeUIntBE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            var maxBytes = Math.pow(2, 8 * byteLength) - 1
            checkInt(this, value, offset, byteLength, maxBytes, 0)
        }

        var i = byteLength - 1
        var mul = 1
        this[offset + i] = value & 0xFF
        while (--i >= 0 && (mul *= 0x100)) {
            this[offset + i] = (value / mul) & 0xFF
        }

        return offset + byteLength
    }

Buffer.prototype.writeUint8 =
    Buffer.prototype.writeUInt8 = function writeUInt8(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
        this[offset] = (value & 0xff)
        return offset + 1
    }

Buffer.prototype.writeUint16LE =
    Buffer.prototype.writeUInt16LE = function writeUInt16LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
        return offset + 2
    }

Buffer.prototype.writeUint16BE =
    Buffer.prototype.writeUInt16BE = function writeUInt16BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
        this[offset] = (value >>> 8)
        this[offset + 1] = (value & 0xff)
        return offset + 2
    }

Buffer.prototype.writeUint32LE =
    Buffer.prototype.writeUInt32LE = function writeUInt32LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
        this[offset + 3] = (value >>> 24)
        this[offset + 2] = (value >>> 16)
        this[offset + 1] = (value >>> 8)
        this[offset] = (value & 0xff)
        return offset + 4
    }

Buffer.prototype.writeUint32BE =
    Buffer.prototype.writeUInt32BE = function writeUInt32BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
        this[offset] = (value >>> 24)
        this[offset + 1] = (value >>> 16)
        this[offset + 2] = (value >>> 8)
        this[offset + 3] = (value & 0xff)
        return offset + 4
    }

Buffer.prototype.writeIntLE = function writeIntLE(value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        var limit = Math.pow(2, (8 * byteLength) - 1)

        checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }

    var i = 0
    var mul = 1
    var sub = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
        if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
            sub = 1
        }
        this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }

    return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE(value, offset, byteLength, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        var limit = Math.pow(2, (8 * byteLength) - 1)

        checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }

    var i = byteLength - 1
    var mul = 1
    var sub = 0
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
        if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
            sub = 1
        }
        this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }

    return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
    if (value < 0) value = 0xff + value + 1
    this[offset] = (value & 0xff)
    return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
    return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    this[offset + 2] = (value >>> 16)
    this[offset + 3] = (value >>> 24)
    return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE(value, offset, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (value < 0) value = 0xffffffff + value + 1
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
    return offset + 4
}

function checkIEEE754(buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat(buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE(value, offset, noAssert) {
    return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE(value, offset, noAssert) {
    return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble(buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE(value, offset, noAssert) {
    return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE(value, offset, noAssert) {
    return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy(target, targetStart, start, end) {
    if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
    if (!start) start = 0
    if (!end && end !== 0) end = this.length
    if (targetStart >= target.length) targetStart = target.length
    if (!targetStart) targetStart = 0
    if (end > 0 && end < start) end = start

    // Copy 0 bytes; we're done
    if (end === start) return 0
    if (target.length === 0 || this.length === 0) return 0

    // Fatal error conditions
    if (targetStart < 0) {
        throw new RangeError('targetStart out of bounds')
    }
    if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
    if (end < 0) throw new RangeError('sourceEnd out of bounds')

    // Are we oob?
    if (end > this.length) end = this.length
    if (target.length - targetStart < end - start) {
        end = target.length - targetStart + start
    }

    var len = end - start

    if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
        // Use built-in when available, missing from IE11
        this.copyWithin(targetStart, start, end)
    } else {
        Uint8Array.prototype.set.call(
            target,
            this.subarray(start, end),
            targetStart
        )
    }

    return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill(val, start, end, encoding) {
    // Handle string cases:
    if (typeof val === 'string') {
        if (typeof start === 'string') {
            encoding = start
            start = 0
            end = this.length
        } else if (typeof end === 'string') {
            encoding = end
            end = this.length
        }
        if (encoding !== undefined && typeof encoding !== 'string') {
            throw new TypeError('encoding must be a string')
        }
        if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
            throw new TypeError('Unknown encoding: ' + encoding)
        }
        if (val.length === 1) {
            var code = val.charCodeAt(0)
            if ((encoding === 'utf8' && code < 128) ||
                encoding === 'latin1') {
                // Fast path: If `val` fits into a single byte, use that numeric value.
                val = code
            }
        }
    } else if (typeof val === 'number') {
        val = val & 255
    } else if (typeof val === 'boolean') {
        val = Number(val)
    }

    // Invalid ranges are not set to a default, so can range check early.
    if (start < 0 || this.length < start || this.length < end) {
        throw new RangeError('Out of range index')
    }

    if (end <= start) {
        return this
    }

    start = start >>> 0
    end = end === undefined ? this.length : end >>> 0

    if (!val) val = 0

    var i
    if (typeof val === 'number') {
        for (i = start; i < end; ++i) {
            this[i] = val
        }
    } else {
        var bytes = Buffer.isBuffer(val)
            ? val
            : Buffer.from(val, encoding)
        var len = bytes.length
        if (len === 0) {
            throw new TypeError('The value "' + val +
                '" is invalid for argument "value"')
        }
        for (i = 0; i < end - start; ++i) {
            this[i + start] = bytes[i % len]
        }
    }

    return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean(str) {
    // Node takes equal signs as end of the Base64 encoding
    str = str.split('=')[0]
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = str.trim().replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
        str = str + '='
    }
    return str
}

function utf8ToBytes(string, units) {
    units = units || Infinity
    var codePoint
    var length = string.length
    var leadSurrogate = null
    var bytes = []

    for (var i = 0; i < length; ++i) {
        codePoint = string.charCodeAt(i)

        // is surrogate component
        if (codePoint > 0xD7FF && codePoint < 0xE000) {
            // last char was a lead
            if (!leadSurrogate) {
                // no lead yet
                if (codePoint > 0xDBFF) {
                    // unexpected trail
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    continue
                } else if (i + 1 === length) {
                    // unpaired lead
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    continue
                }

                // valid lead
                leadSurrogate = codePoint

                continue
            }

            // 2 leads in a row
            if (codePoint < 0xDC00) {
                if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                leadSurrogate = codePoint
                continue
            }

            // valid surrogate pair
            codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
        } else if (leadSurrogate) {
            // valid bmp char, but last char was a lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        }

        leadSurrogate = null

        // encode utf8
        if (codePoint < 0x80) {
            if ((units -= 1) < 0) break
            bytes.push(codePoint)
        } else if (codePoint < 0x800) {
            if ((units -= 2) < 0) break
            bytes.push(
                codePoint >> 0x6 | 0xC0,
                codePoint & 0x3F | 0x80
            )
        } else if (codePoint < 0x10000) {
            if ((units -= 3) < 0) break
            bytes.push(
                codePoint >> 0xC | 0xE0,
                codePoint >> 0x6 & 0x3F | 0x80,
                codePoint & 0x3F | 0x80
            )
        } else if (codePoint < 0x110000) {
            if ((units -= 4) < 0) break
            bytes.push(
                codePoint >> 0x12 | 0xF0,
                codePoint >> 0xC & 0x3F | 0x80,
                codePoint >> 0x6 & 0x3F | 0x80,
                codePoint & 0x3F | 0x80
            )
        } else {
            throw new Error('Invalid code point')
        }
    }

    return bytes
}

function asciiToBytes(str) {
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
        // Node's code seems to be doing this and not & 0x7F..
        byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
}

function utf16leToBytes(str, units) {
    var c, hi, lo
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
        if ((units -= 2) < 0) break

        c = str.charCodeAt(i)
        hi = c >> 8
        lo = c % 256
        byteArray.push(lo)
        byteArray.push(hi)
    }

    return byteArray
}

function base64ToBytes(str) {
    return base64.toByteArray(base64clean(str))
}

function blitBuffer(src, dst, offset, length) {
    for (var i = 0; i < length; ++i) {
        if ((i + offset >= dst.length) || (i >= src.length)) break
        dst[i + offset] = src[i]
    }
    return i
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance(obj, type) {
    return obj instanceof type ||
        (obj != null && obj.constructor != null && obj.constructor.name != null &&
            obj.constructor.name === type.name)
}
function numberIsNaN(obj) {
    // For IE11 support
    return obj !== obj // eslint-disable-line no-self-compare
}

// Create lookup table for `toString('hex')`
// See: https://github.com/feross/buffer/issues/219
var hexSliceLookupTable = (function () {
    var alphabet = '0123456789abcdef'
    var table = new Array(256)
    for (var i = 0; i < 16; ++i) {
        var i16 = i * 16
        for (var j = 0; j < 16; ++j) {
            table[i16 + j] = alphabet[i] + alphabet[j]
        }
    }
    return table
})()

export { Buffer, SlowBuffer, INSPECT_MAX_BYTES, K_MAX_LENGTH, kMaxLength };